Fix clang build by moving ToLowerASCII into base namespace.

base/string_util.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/string_util.h"
 
 #include "build/build_config.h"
 
 #include <ctype.h>
 #include <errno.h>
@@ skipping 466 matching lines @@
        return false;
   }
   return true;
 }
 
 template<typename Iter>
 static inline bool DoLowerCaseEqualsASCII(Iter a_begin,
                                           Iter a_end,
                                           const char* b) {
   for (Iter it = a_begin; it != a_end; ++it, ++b) {
-    if (!*b || ToLowerASCII(*it) != *b)
+    if (!*b || base::ToLowerASCII(*it) != *b)
       return false;
   }
   return *b == 0;
 }
 
 // Front-ends for LowerCaseEqualsASCII.
 bool LowerCaseEqualsASCII(const std::string& a, const char* b) {
   return DoLowerCaseEqualsASCII(a.begin(), a.end(), b);
 }
 
@@ skipping 679 matching lines @@
       int rstr_len = (max_len - 3) / 2;
       int lstr_len = rstr_len + ((max_len - 3) % 2);
       output->assign(input.substr(0, lstr_len) + L"..." +
                      input.substr(input.length() - rstr_len));
       break;
     }
   }
 
   return true;
 }